An organic photoreceptor and an electrophotographic image forming
apparatus employing the organic photoreceptor are provided, where the
organic photoreceptor has high photosensitivity with respect to light
radiation at short wavelengths and low exposure potential. Specifically,
an organic photoreceptor for short wavelengths having a photosensitive
layer including a naphthalene tetracarboxylic acid diimide derivative is
formed on an electrically conductive substrate.